The finest burritos in the world are made in San Francisco’s Mission District. But how can you get a hot & fresh one in New York City in time for lunch? Physics, that’s how. For this very serious and scientific video, we dug a classic...

In this video Paul Andersen explains how the total energy of a system is the combination of kinetic, potential and internal energy of the objects. He then shows you how to calculate the kinetic energy, gravitational potential energy,...

A launch mishap led to the best experimental confirmation of gravitational redshift.

University of Chicago cosmologist Rocky Kolb describes the history of dark matter: how it was overlooked by most physicists for decades together with current hypotheses of what it might be and experiments to determine which one is valid.

In this video I prove that the work done by the force due to gravity (assumed to be constant and downwards) is equal to the change in gravitational potential energy.

Feb.19 -- Though humans don't experience it in their daily lives, gravity and movement can change how time elapses. Ultra-precise atomic clocks are now able to measure these tiny changes, known as time dilation. It's a technological...